This reference design includes a flyback stage
which provides two 12 VDC with 600-V functional isolation for independent operation.
But, during the firmware test process, the setup with an axillary power board is not
expected, because no power is expected to exist on the DC bus when operating the
firmware.
The following steps show the common setup with
external VCC power supply:
- Remove or disconnect the flyback board, if it is
assembled
- Make sure C2000 and GaN board is well
assembled
- Connect 12VDC1 to ‘12Vc’ and ‘GND-c’; Connect
another 12VDC2 to ‘12V-L’ & ‘B-’; (12VDC1 and 12VDC2 must have 500 VDC
isolation ability to each other)
- Connect the AC source cable to the input
terminal, but do not power up
- Connect the DC load to output terminal (pay
attention for the DC polarity. And, the load must be
isolated with grid and PE line)
- Use forced-air cooling fan to cool the board
- Insert power meter with current and voltage
meter, before testing efficiency. (Make sure all voltage probes are near to the
board side.)